<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<?php
			$a = 3 + "abc10";
			$b = 3 + " 10abc";
			$c = "abc10" + 3;
			$d = "10abc" + 3;
			echo "<br/>3+'abc10'的值是".$a;
			echo "<br/>3+'10abc'的值是".$b;
			echo "<br/>'abc10'+3的值是".$c;
			echo "<br/>'10abc'+3的值是".$d;
			
			$e = 3 + true;
			echo "<br/>3+ true 的值是".$e;
			$f = false + "10abc";
			echo "<br/>false + '10abc'的值是".$f;
		?>

	</body>
</html>